No one can understand Lafayette in Aaron burr, sir.

What Lafayette say's  in Aaron Burr, Sir;

Oui oui, mon ami, je m’appelle Lafayette!The Lancelot of the revolutionary set!
I came from afar just to say Bonsoir! Tell the King Casse toi! Who’s the best? C’est moi!

So what the heck Daveed? Nice french Vocab and accent but please, i don't understand a word your saying. So to make me suffer and make it way easy for other people, i translated it.  

Yes yes, my friend, my name is Lafayette! The Lancelot of the revolutionary set! I came from afar just so say Good evening! Tell the king Get lost! Who's the best? It's me!

So "Get lost" or "Casse toi" can be replaced with "F*ck off." Guys, its Hamilton, they cuss.